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1341 lines
37 KiB
1341 lines
37 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* OMAP2/3/4 clockdomain framework functions |
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* |
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* Copyright (C) 2008-2011 Texas Instruments, Inc. |
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* Copyright (C) 2008-2011 Nokia Corporation |
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* |
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* Written by Paul Walmsley and Jouni Högander |
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* Added OMAP4 specific support by Abhijit Pagare <[email protected]> |
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*/ |
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#undef DEBUG |
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|
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/list.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/delay.h> |
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#include <linux/clk.h> |
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#include <linux/limits.h> |
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#include <linux/err.h> |
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#include <linux/clk-provider.h> |
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#include <linux/cpu_pm.h> |
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|
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#include <linux/io.h> |
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|
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#include <linux/bitops.h> |
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|
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#include "soc.h" |
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#include "clock.h" |
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#include "clockdomain.h" |
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#include "pm.h" |
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|
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/* clkdm_list contains all registered struct clockdomains */ |
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static LIST_HEAD(clkdm_list); |
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|
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/* array of clockdomain deps to be added/removed when clkdm in hwsup mode */ |
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static struct clkdm_autodep *autodeps; |
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|
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static struct clkdm_ops *arch_clkdm; |
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void clkdm_save_context(void); |
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void clkdm_restore_context(void); |
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|
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/* Private functions */ |
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|
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static struct clockdomain *_clkdm_lookup(const char *name) |
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{ |
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struct clockdomain *clkdm, *temp_clkdm; |
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|
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if (!name) |
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return NULL; |
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clkdm = NULL; |
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|
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list_for_each_entry(temp_clkdm, &clkdm_list, node) { |
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if (!strcmp(name, temp_clkdm->name)) { |
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clkdm = temp_clkdm; |
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break; |
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} |
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} |
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|
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return clkdm; |
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} |
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|
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/** |
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* _clkdm_register - register a clockdomain |
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* @clkdm: struct clockdomain * to register |
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* |
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* Adds a clockdomain to the internal clockdomain list. |
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* Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is |
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* already registered by the provided name, or 0 upon success. |
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*/ |
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static int _clkdm_register(struct clockdomain *clkdm) |
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{ |
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struct powerdomain *pwrdm; |
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|
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if (!clkdm || !clkdm->name) |
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return -EINVAL; |
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pwrdm = pwrdm_lookup(clkdm->pwrdm.name); |
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if (!pwrdm) { |
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pr_err("clockdomain: %s: powerdomain %s does not exist\n", |
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clkdm->name, clkdm->pwrdm.name); |
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return -EINVAL; |
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} |
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clkdm->pwrdm.ptr = pwrdm; |
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|
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/* Verify that the clockdomain is not already registered */ |
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if (_clkdm_lookup(clkdm->name)) |
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return -EEXIST; |
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list_add(&clkdm->node, &clkdm_list); |
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pwrdm_add_clkdm(pwrdm, clkdm); |
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pr_debug("clockdomain: registered %s\n", clkdm->name); |
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return 0; |
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} |
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/* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */ |
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static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm, |
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struct clkdm_dep *deps) |
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{ |
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struct clkdm_dep *cd; |
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|
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if (!clkdm || !deps) |
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return ERR_PTR(-EINVAL); |
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|
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for (cd = deps; cd->clkdm_name; cd++) { |
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if (!cd->clkdm && cd->clkdm_name) |
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cd->clkdm = _clkdm_lookup(cd->clkdm_name); |
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|
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if (cd->clkdm == clkdm) |
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break; |
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} |
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|
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if (!cd->clkdm_name) |
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return ERR_PTR(-ENOENT); |
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return cd; |
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} |
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/** |
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* _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store |
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* @autodep: struct clkdm_autodep * to resolve |
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* |
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* Resolve autodep clockdomain names to clockdomain pointers via |
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* clkdm_lookup() and store the pointers in the autodep structure. An |
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* "autodep" is a clockdomain sleep/wakeup dependency that is |
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* automatically added and removed whenever clocks in the associated |
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* clockdomain are enabled or disabled (respectively) when the |
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* clockdomain is in hardware-supervised mode. Meant to be called |
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* once at clockdomain layer initialization, since these should remain |
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* fixed for a particular architecture. No return value. |
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* |
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* XXX autodeps are deprecated and should be removed at the earliest |
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* opportunity |
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*/ |
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static void _autodep_lookup(struct clkdm_autodep *autodep) |
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{ |
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struct clockdomain *clkdm; |
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|
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if (!autodep) |
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return; |
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clkdm = clkdm_lookup(autodep->clkdm.name); |
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if (!clkdm) { |
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pr_err("clockdomain: autodeps: clockdomain %s does not exist\n", |
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autodep->clkdm.name); |
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clkdm = ERR_PTR(-ENOENT); |
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} |
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autodep->clkdm.ptr = clkdm; |
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} |
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/** |
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* _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms |
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* @clkdm: clockdomain that we are resolving dependencies for |
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* @clkdm_deps: ptr to array of struct clkdm_deps to resolve |
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* |
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* Iterates through @clkdm_deps, looking up the struct clockdomain named by |
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* clkdm_name and storing the clockdomain pointer in the struct clkdm_dep. |
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* No return value. |
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*/ |
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static void _resolve_clkdm_deps(struct clockdomain *clkdm, |
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struct clkdm_dep *clkdm_deps) |
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{ |
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struct clkdm_dep *cd; |
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|
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for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) { |
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if (cd->clkdm) |
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continue; |
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cd->clkdm = _clkdm_lookup(cd->clkdm_name); |
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|
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WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen", |
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clkdm->name, cd->clkdm_name); |
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} |
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} |
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|
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/** |
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* _clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 (lockless) |
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* @clkdm1: wake this struct clockdomain * up (dependent) |
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* @clkdm2: when this struct clockdomain * wakes up (source) |
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* |
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* When the clockdomain represented by @clkdm2 wakes up, wake up |
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* @clkdm1. Implemented in hardware on the OMAP, this feature is |
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* designed to reduce wakeup latency of the dependent clockdomain @clkdm1. |
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* Returns -EINVAL if presented with invalid clockdomain pointers, |
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* -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon |
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* success. |
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*/ |
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static int _clkdm_add_wkdep(struct clockdomain *clkdm1, |
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struct clockdomain *clkdm2) |
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{ |
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struct clkdm_dep *cd; |
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int ret = 0; |
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|
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if (!clkdm1 || !clkdm2) |
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return -EINVAL; |
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
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if (IS_ERR(cd)) |
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ret = PTR_ERR(cd); |
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|
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if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep) |
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ret = -EINVAL; |
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|
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if (ret) { |
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pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n", |
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clkdm1->name, clkdm2->name); |
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return ret; |
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} |
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cd->wkdep_usecount++; |
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if (cd->wkdep_usecount == 1) { |
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pr_debug("clockdomain: hardware will wake up %s when %s wakes up\n", |
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clkdm1->name, clkdm2->name); |
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|
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ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2); |
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} |
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return ret; |
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} |
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/** |
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* _clkdm_del_wkdep - remove a wakeup dep from clkdm2 to clkdm1 (lockless) |
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* @clkdm1: wake this struct clockdomain * up (dependent) |
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* @clkdm2: when this struct clockdomain * wakes up (source) |
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* |
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* Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2 |
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* wakes up. Returns -EINVAL if presented with invalid clockdomain |
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* pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or |
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* 0 upon success. |
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*/ |
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static int _clkdm_del_wkdep(struct clockdomain *clkdm1, |
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struct clockdomain *clkdm2) |
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{ |
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struct clkdm_dep *cd; |
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int ret = 0; |
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|
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if (!clkdm1 || !clkdm2) |
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return -EINVAL; |
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
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if (IS_ERR(cd)) |
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ret = PTR_ERR(cd); |
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if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep) |
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ret = -EINVAL; |
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if (ret) { |
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pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n", |
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clkdm1->name, clkdm2->name); |
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return ret; |
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} |
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cd->wkdep_usecount--; |
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if (cd->wkdep_usecount == 0) { |
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pr_debug("clockdomain: hardware will no longer wake up %s after %s wakes up\n", |
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clkdm1->name, clkdm2->name); |
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ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2); |
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} |
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return ret; |
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} |
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|
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/** |
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* _clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 (lockless) |
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* @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
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* @clkdm2: when this struct clockdomain * is active (source) |
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* |
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* Prevent @clkdm1 from automatically going inactive (and then to |
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* retention or off) if @clkdm2 is active. Returns -EINVAL if |
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* presented with invalid clockdomain pointers or called on a machine |
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* that does not support software-configurable hardware sleep |
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* dependencies, -ENOENT if the specified dependency cannot be set in |
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* hardware, or 0 upon success. |
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*/ |
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static int _clkdm_add_sleepdep(struct clockdomain *clkdm1, |
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struct clockdomain *clkdm2) |
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{ |
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struct clkdm_dep *cd; |
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int ret = 0; |
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|
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if (!clkdm1 || !clkdm2) |
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return -EINVAL; |
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); |
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if (IS_ERR(cd)) |
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ret = PTR_ERR(cd); |
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if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep) |
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ret = -EINVAL; |
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if (ret) { |
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pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n", |
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clkdm1->name, clkdm2->name); |
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return ret; |
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} |
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cd->sleepdep_usecount++; |
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if (cd->sleepdep_usecount == 1) { |
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pr_debug("clockdomain: will prevent %s from sleeping if %s is active\n", |
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clkdm1->name, clkdm2->name); |
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ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2); |
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} |
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return ret; |
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} |
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/** |
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* _clkdm_del_sleepdep - remove a sleep dep from clkdm2 to clkdm1 (lockless) |
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* @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
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* @clkdm2: when this struct clockdomain * is active (source) |
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* |
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* Allow @clkdm1 to automatically go inactive (and then to retention or |
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* off), independent of the activity state of @clkdm2. Returns -EINVAL |
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* if presented with invalid clockdomain pointers or called on a machine |
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* that does not support software-configurable hardware sleep dependencies, |
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* -ENOENT if the specified dependency cannot be cleared in hardware, or |
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* 0 upon success. |
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*/ |
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static int _clkdm_del_sleepdep(struct clockdomain *clkdm1, |
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struct clockdomain *clkdm2) |
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{ |
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struct clkdm_dep *cd; |
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int ret = 0; |
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if (!clkdm1 || !clkdm2) |
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return -EINVAL; |
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); |
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if (IS_ERR(cd)) |
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ret = PTR_ERR(cd); |
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if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep) |
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ret = -EINVAL; |
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if (ret) { |
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pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n", |
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clkdm1->name, clkdm2->name); |
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return ret; |
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} |
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cd->sleepdep_usecount--; |
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if (cd->sleepdep_usecount == 0) { |
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pr_debug("clockdomain: will no longer prevent %s from sleeping if %s is active\n", |
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clkdm1->name, clkdm2->name); |
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|
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ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2); |
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} |
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return ret; |
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} |
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|
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/* Public functions */ |
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|
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/** |
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* clkdm_register_platform_funcs - register clockdomain implementation fns |
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* @co: func pointers for arch specific implementations |
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* |
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* Register the list of function pointers used to implement the |
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* clockdomain functions on different OMAP SoCs. Should be called |
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* before any other clkdm_register*() function. Returns -EINVAL if |
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* @co is null, -EEXIST if platform functions have already been |
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* registered, or 0 upon success. |
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*/ |
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int clkdm_register_platform_funcs(struct clkdm_ops *co) |
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{ |
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if (!co) |
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return -EINVAL; |
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if (arch_clkdm) |
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return -EEXIST; |
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arch_clkdm = co; |
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return 0; |
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}; |
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|
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/** |
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* clkdm_register_clkdms - register SoC clockdomains |
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* @cs: pointer to an array of struct clockdomain to register |
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* |
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* Register the clockdomains available on a particular OMAP SoC. Must |
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* be called after clkdm_register_platform_funcs(). May be called |
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* multiple times. Returns -EACCES if called before |
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* clkdm_register_platform_funcs(); -EINVAL if the argument @cs is |
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* null; or 0 upon success. |
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*/ |
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int clkdm_register_clkdms(struct clockdomain **cs) |
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{ |
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struct clockdomain **c = NULL; |
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|
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if (!arch_clkdm) |
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return -EACCES; |
|
|
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if (!cs) |
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return -EINVAL; |
|
|
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for (c = cs; *c; c++) |
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_clkdm_register(*c); |
|
|
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return 0; |
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} |
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|
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/** |
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* clkdm_register_autodeps - register autodeps (if required) |
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* @ia: pointer to a static array of struct clkdm_autodep to register |
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* |
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* Register clockdomain "automatic dependencies." These are |
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* clockdomain wakeup and sleep dependencies that are automatically |
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* added whenever the first clock inside a clockdomain is enabled, and |
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* removed whenever the last clock inside a clockdomain is disabled. |
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* These are currently only used on OMAP3 devices, and are deprecated, |
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* since they waste energy. However, until the OMAP2/3 IP block |
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* enable/disable sequence can be converted to match the OMAP4 |
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* sequence, they are needed. |
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* |
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* Must be called only after all of the SoC clockdomains are |
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* registered, since the function will resolve autodep clockdomain |
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* names into clockdomain pointers. |
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* |
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* The struct clkdm_autodep @ia array must be static, as this function |
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* does not copy the array elements. |
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* |
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* Returns -EACCES if called before any clockdomains have been |
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* registered, -EINVAL if called with a null @ia argument, -EEXIST if |
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* autodeps have already been registered, or 0 upon success. |
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*/ |
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int clkdm_register_autodeps(struct clkdm_autodep *ia) |
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{ |
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struct clkdm_autodep *a = NULL; |
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|
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if (list_empty(&clkdm_list)) |
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return -EACCES; |
|
|
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if (!ia) |
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return -EINVAL; |
|
|
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if (autodeps) |
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return -EEXIST; |
|
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autodeps = ia; |
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for (a = autodeps; a->clkdm.ptr; a++) |
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_autodep_lookup(a); |
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|
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return 0; |
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} |
|
|
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static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v) |
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{ |
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switch (cmd) { |
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case CPU_CLUSTER_PM_ENTER: |
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if (enable_off_mode) |
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clkdm_save_context(); |
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break; |
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case CPU_CLUSTER_PM_EXIT: |
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if (enable_off_mode) |
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clkdm_restore_context(); |
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break; |
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} |
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|
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return NOTIFY_OK; |
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} |
|
|
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/** |
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* clkdm_complete_init - set up the clockdomain layer |
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* |
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* Put all clockdomains into software-supervised mode; PM code should |
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* later enable hardware-supervised mode as appropriate. Must be |
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* called after clkdm_register_clkdms(). Returns -EACCES if called |
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* before clkdm_register_clkdms(), or 0 upon success. |
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*/ |
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int clkdm_complete_init(void) |
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{ |
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struct clockdomain *clkdm; |
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static struct notifier_block nb; |
|
|
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if (list_empty(&clkdm_list)) |
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return -EACCES; |
|
|
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list_for_each_entry(clkdm, &clkdm_list, node) { |
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clkdm_deny_idle(clkdm); |
|
|
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_resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs); |
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clkdm_clear_all_wkdeps(clkdm); |
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|
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_resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs); |
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clkdm_clear_all_sleepdeps(clkdm); |
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} |
|
|
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/* Only AM43XX can lose clkdm context during rtc-ddr suspend */ |
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if (soc_is_am43xx()) { |
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nb.notifier_call = cpu_notifier; |
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cpu_pm_register_notifier(&nb); |
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} |
|
|
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return 0; |
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} |
|
|
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/** |
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* clkdm_lookup - look up a clockdomain by name, return a pointer |
|
* @name: name of clockdomain |
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* |
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* Find a registered clockdomain by its name @name. Returns a pointer |
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* to the struct clockdomain if found, or NULL otherwise. |
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*/ |
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struct clockdomain *clkdm_lookup(const char *name) |
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{ |
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struct clockdomain *clkdm, *temp_clkdm; |
|
|
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if (!name) |
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return NULL; |
|
|
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clkdm = NULL; |
|
|
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list_for_each_entry(temp_clkdm, &clkdm_list, node) { |
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if (!strcmp(name, temp_clkdm->name)) { |
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clkdm = temp_clkdm; |
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break; |
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} |
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} |
|
|
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return clkdm; |
|
} |
|
|
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/** |
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* clkdm_for_each - call function on each registered clockdomain |
|
* @fn: callback function * |
|
* |
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* Call the supplied function @fn for each registered clockdomain. |
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* The callback function @fn can return anything but 0 to bail |
|
* out early from the iterator. The callback function is called with |
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* the clkdm_mutex held, so no clockdomain structure manipulation |
|
* functions should be called from the callback, although hardware |
|
* clockdomain control functions are fine. Returns the last return |
|
* value of the callback function, which should be 0 for success or |
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* anything else to indicate failure; or -EINVAL if the function pointer |
|
* is null. |
|
*/ |
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int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user), |
|
void *user) |
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{ |
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struct clockdomain *clkdm; |
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int ret = 0; |
|
|
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if (!fn) |
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return -EINVAL; |
|
|
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list_for_each_entry(clkdm, &clkdm_list, node) { |
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ret = (*fn)(clkdm, user); |
|
if (ret) |
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break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
|
|
/** |
|
* clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Return a pointer to the struct powerdomain that the specified clockdomain |
|
* @clkdm exists in, or returns NULL if @clkdm is NULL. |
|
*/ |
|
struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm) |
|
{ |
|
if (!clkdm) |
|
return NULL; |
|
|
|
return clkdm->pwrdm.ptr; |
|
} |
|
|
|
|
|
/* Hardware clockdomain control */ |
|
|
|
/** |
|
* clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 |
|
* @clkdm1: wake this struct clockdomain * up (dependent) |
|
* @clkdm2: when this struct clockdomain * wakes up (source) |
|
* |
|
* When the clockdomain represented by @clkdm2 wakes up, wake up |
|
* @clkdm1. Implemented in hardware on the OMAP, this feature is |
|
* designed to reduce wakeup latency of the dependent clockdomain @clkdm1. |
|
* Returns -EINVAL if presented with invalid clockdomain pointers, |
|
* -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon |
|
* success. |
|
*/ |
|
int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
|
{ |
|
struct clkdm_dep *cd; |
|
int ret; |
|
|
|
if (!clkdm1 || !clkdm2) |
|
return -EINVAL; |
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
|
if (IS_ERR(cd)) |
|
return PTR_ERR(cd); |
|
|
|
pwrdm_lock(cd->clkdm->pwrdm.ptr); |
|
ret = _clkdm_add_wkdep(clkdm1, clkdm2); |
|
pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1 |
|
* @clkdm1: wake this struct clockdomain * up (dependent) |
|
* @clkdm2: when this struct clockdomain * wakes up (source) |
|
* |
|
* Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2 |
|
* wakes up. Returns -EINVAL if presented with invalid clockdomain |
|
* pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or |
|
* 0 upon success. |
|
*/ |
|
int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
|
{ |
|
struct clkdm_dep *cd; |
|
int ret; |
|
|
|
if (!clkdm1 || !clkdm2) |
|
return -EINVAL; |
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
|
if (IS_ERR(cd)) |
|
return PTR_ERR(cd); |
|
|
|
pwrdm_lock(cd->clkdm->pwrdm.ptr); |
|
ret = _clkdm_del_wkdep(clkdm1, clkdm2); |
|
pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1 |
|
* @clkdm1: wake this struct clockdomain * up (dependent) |
|
* @clkdm2: when this struct clockdomain * wakes up (source) |
|
* |
|
* Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be |
|
* awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL |
|
* if either clockdomain pointer is invalid; or -ENOENT if the hardware |
|
* is incapable. |
|
* |
|
* REVISIT: Currently this function only represents software-controllable |
|
* wakeup dependencies. Wakeup dependencies fixed in hardware are not |
|
* yet handled here. |
|
*/ |
|
int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
|
{ |
|
struct clkdm_dep *cd; |
|
int ret = 0; |
|
|
|
if (!clkdm1 || !clkdm2) |
|
return -EINVAL; |
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
|
if (IS_ERR(cd)) |
|
ret = PTR_ERR(cd); |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_read_wkdep) |
|
ret = -EINVAL; |
|
|
|
if (ret) { |
|
pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n", |
|
clkdm1->name, clkdm2->name); |
|
return ret; |
|
} |
|
|
|
/* XXX It's faster to return the wkdep_usecount */ |
|
return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2); |
|
} |
|
|
|
/** |
|
* clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm |
|
* @clkdm: struct clockdomain * to remove all wakeup dependencies from |
|
* |
|
* Remove all inter-clockdomain wakeup dependencies that could cause |
|
* @clkdm to wake. Intended to be used during boot to initialize the |
|
* PRCM to a known state, after all clockdomains are put into swsup idle |
|
* and woken up. Returns -EINVAL if @clkdm pointer is invalid, or |
|
* 0 upon success. |
|
*/ |
|
int clkdm_clear_all_wkdeps(struct clockdomain *clkdm) |
|
{ |
|
if (!clkdm) |
|
return -EINVAL; |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_wkdeps) |
|
return -EINVAL; |
|
|
|
return arch_clkdm->clkdm_clear_all_wkdeps(clkdm); |
|
} |
|
|
|
/** |
|
* clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 |
|
* @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
|
* @clkdm2: when this struct clockdomain * is active (source) |
|
* |
|
* Prevent @clkdm1 from automatically going inactive (and then to |
|
* retention or off) if @clkdm2 is active. Returns -EINVAL if |
|
* presented with invalid clockdomain pointers or called on a machine |
|
* that does not support software-configurable hardware sleep |
|
* dependencies, -ENOENT if the specified dependency cannot be set in |
|
* hardware, or 0 upon success. |
|
*/ |
|
int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
|
{ |
|
struct clkdm_dep *cd; |
|
int ret; |
|
|
|
if (!clkdm1 || !clkdm2) |
|
return -EINVAL; |
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
|
if (IS_ERR(cd)) |
|
return PTR_ERR(cd); |
|
|
|
pwrdm_lock(cd->clkdm->pwrdm.ptr); |
|
ret = _clkdm_add_sleepdep(clkdm1, clkdm2); |
|
pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1 |
|
* @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
|
* @clkdm2: when this struct clockdomain * is active (source) |
|
* |
|
* Allow @clkdm1 to automatically go inactive (and then to retention or |
|
* off), independent of the activity state of @clkdm2. Returns -EINVAL |
|
* if presented with invalid clockdomain pointers or called on a machine |
|
* that does not support software-configurable hardware sleep dependencies, |
|
* -ENOENT if the specified dependency cannot be cleared in hardware, or |
|
* 0 upon success. |
|
*/ |
|
int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
|
{ |
|
struct clkdm_dep *cd; |
|
int ret; |
|
|
|
if (!clkdm1 || !clkdm2) |
|
return -EINVAL; |
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
|
if (IS_ERR(cd)) |
|
return PTR_ERR(cd); |
|
|
|
pwrdm_lock(cd->clkdm->pwrdm.ptr); |
|
ret = _clkdm_del_sleepdep(clkdm1, clkdm2); |
|
pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1 |
|
* @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
|
* @clkdm2: when this struct clockdomain * is active (source) |
|
* |
|
* Return 1 if a hardware sleep dependency exists wherein @clkdm1 will |
|
* not be allowed to automatically go inactive if @clkdm2 is active; |
|
* 0 if @clkdm1's automatic power state inactivity transition is independent |
|
* of @clkdm2's; -EINVAL if either clockdomain pointer is invalid or called |
|
* on a machine that does not support software-configurable hardware sleep |
|
* dependencies; or -ENOENT if the hardware is incapable. |
|
* |
|
* REVISIT: Currently this function only represents software-controllable |
|
* sleep dependencies. Sleep dependencies fixed in hardware are not |
|
* yet handled here. |
|
*/ |
|
int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
|
{ |
|
struct clkdm_dep *cd; |
|
int ret = 0; |
|
|
|
if (!clkdm1 || !clkdm2) |
|
return -EINVAL; |
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); |
|
if (IS_ERR(cd)) |
|
ret = PTR_ERR(cd); |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_read_sleepdep) |
|
ret = -EINVAL; |
|
|
|
if (ret) { |
|
pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n", |
|
clkdm1->name, clkdm2->name); |
|
return ret; |
|
} |
|
|
|
/* XXX It's faster to return the sleepdep_usecount */ |
|
return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2); |
|
} |
|
|
|
/** |
|
* clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm |
|
* @clkdm: struct clockdomain * to remove all sleep dependencies from |
|
* |
|
* Remove all inter-clockdomain sleep dependencies that could prevent |
|
* @clkdm from idling. Intended to be used during boot to initialize the |
|
* PRCM to a known state, after all clockdomains are put into swsup idle |
|
* and woken up. Returns -EINVAL if @clkdm pointer is invalid, or |
|
* 0 upon success. |
|
*/ |
|
int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm) |
|
{ |
|
if (!clkdm) |
|
return -EINVAL; |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_sleepdeps) |
|
return -EINVAL; |
|
|
|
return arch_clkdm->clkdm_clear_all_sleepdeps(clkdm); |
|
} |
|
|
|
/** |
|
* clkdm_sleep_nolock - force clockdomain sleep transition (lockless) |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Instruct the CM to force a sleep transition on the specified |
|
* clockdomain @clkdm. Only for use by the powerdomain code. Returns |
|
* -EINVAL if @clkdm is NULL or if clockdomain does not support |
|
* software-initiated sleep; 0 upon success. |
|
*/ |
|
int clkdm_sleep_nolock(struct clockdomain *clkdm) |
|
{ |
|
int ret; |
|
|
|
if (!clkdm) |
|
return -EINVAL; |
|
|
|
if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { |
|
pr_debug("clockdomain: %s does not support forcing sleep via software\n", |
|
clkdm->name); |
|
return -EINVAL; |
|
} |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_sleep) |
|
return -EINVAL; |
|
|
|
pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name); |
|
|
|
clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
|
ret = arch_clkdm->clkdm_sleep(clkdm); |
|
ret |= pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_sleep - force clockdomain sleep transition |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Instruct the CM to force a sleep transition on the specified |
|
* clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if |
|
* clockdomain does not support software-initiated sleep; 0 upon |
|
* success. |
|
*/ |
|
int clkdm_sleep(struct clockdomain *clkdm) |
|
{ |
|
int ret; |
|
|
|
pwrdm_lock(clkdm->pwrdm.ptr); |
|
ret = clkdm_sleep_nolock(clkdm); |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_wakeup_nolock - force clockdomain wakeup transition (lockless) |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Instruct the CM to force a wakeup transition on the specified |
|
* clockdomain @clkdm. Only for use by the powerdomain code. Returns |
|
* -EINVAL if @clkdm is NULL or if the clockdomain does not support |
|
* software-controlled wakeup; 0 upon success. |
|
*/ |
|
int clkdm_wakeup_nolock(struct clockdomain *clkdm) |
|
{ |
|
int ret; |
|
|
|
if (!clkdm) |
|
return -EINVAL; |
|
|
|
if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) { |
|
pr_debug("clockdomain: %s does not support forcing wakeup via software\n", |
|
clkdm->name); |
|
return -EINVAL; |
|
} |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_wakeup) |
|
return -EINVAL; |
|
|
|
pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name); |
|
|
|
clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
|
ret = arch_clkdm->clkdm_wakeup(clkdm); |
|
ret |= pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_wakeup - force clockdomain wakeup transition |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Instruct the CM to force a wakeup transition on the specified |
|
* clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the |
|
* clockdomain does not support software-controlled wakeup; 0 upon |
|
* success. |
|
*/ |
|
int clkdm_wakeup(struct clockdomain *clkdm) |
|
{ |
|
int ret; |
|
|
|
pwrdm_lock(clkdm->pwrdm.ptr); |
|
ret = clkdm_wakeup_nolock(clkdm); |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_allow_idle_nolock - enable hwsup idle transitions for clkdm |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Allow the hardware to automatically switch the clockdomain @clkdm |
|
* into active or idle states, as needed by downstream clocks. If the |
|
* clockdomain has any downstream clocks enabled in the clock |
|
* framework, wkdep/sleepdep autodependencies are added; this is so |
|
* device drivers can read and write to the device. Only for use by |
|
* the powerdomain code. No return value. |
|
*/ |
|
void clkdm_allow_idle_nolock(struct clockdomain *clkdm) |
|
{ |
|
if (!clkdm) |
|
return; |
|
|
|
if (!WARN_ON(!clkdm->forcewake_count)) |
|
clkdm->forcewake_count--; |
|
|
|
if (clkdm->forcewake_count) |
|
return; |
|
|
|
if (!clkdm->usecount && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) |
|
clkdm_sleep_nolock(clkdm); |
|
|
|
if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) |
|
return; |
|
|
|
if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) |
|
return; |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_allow_idle) |
|
return; |
|
|
|
pr_debug("clockdomain: enabling automatic idle transitions for %s\n", |
|
clkdm->name); |
|
|
|
clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED; |
|
arch_clkdm->clkdm_allow_idle(clkdm); |
|
pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
|
} |
|
|
|
/** |
|
* clkdm_allow_idle - enable hwsup idle transitions for clkdm |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Allow the hardware to automatically switch the clockdomain @clkdm into |
|
* active or idle states, as needed by downstream clocks. If the |
|
* clockdomain has any downstream clocks enabled in the clock |
|
* framework, wkdep/sleepdep autodependencies are added; this is so |
|
* device drivers can read and write to the device. No return value. |
|
*/ |
|
void clkdm_allow_idle(struct clockdomain *clkdm) |
|
{ |
|
pwrdm_lock(clkdm->pwrdm.ptr); |
|
clkdm_allow_idle_nolock(clkdm); |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
} |
|
|
|
/** |
|
* clkdm_deny_idle - disable hwsup idle transitions for clkdm |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Prevent the hardware from automatically switching the clockdomain |
|
* @clkdm into inactive or idle states. If the clockdomain has |
|
* downstream clocks enabled in the clock framework, wkdep/sleepdep |
|
* autodependencies are removed. Only for use by the powerdomain |
|
* code. No return value. |
|
*/ |
|
void clkdm_deny_idle_nolock(struct clockdomain *clkdm) |
|
{ |
|
if (!clkdm) |
|
return; |
|
|
|
if (clkdm->forcewake_count++) |
|
return; |
|
|
|
if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP) |
|
clkdm_wakeup_nolock(clkdm); |
|
|
|
if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) |
|
return; |
|
|
|
if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) |
|
return; |
|
|
|
if (!arch_clkdm || !arch_clkdm->clkdm_deny_idle) |
|
return; |
|
|
|
pr_debug("clockdomain: disabling automatic idle transitions for %s\n", |
|
clkdm->name); |
|
|
|
clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
|
arch_clkdm->clkdm_deny_idle(clkdm); |
|
pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
|
} |
|
|
|
/** |
|
* clkdm_deny_idle - disable hwsup idle transitions for clkdm |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Prevent the hardware from automatically switching the clockdomain |
|
* @clkdm into inactive or idle states. If the clockdomain has |
|
* downstream clocks enabled in the clock framework, wkdep/sleepdep |
|
* autodependencies are removed. No return value. |
|
*/ |
|
void clkdm_deny_idle(struct clockdomain *clkdm) |
|
{ |
|
pwrdm_lock(clkdm->pwrdm.ptr); |
|
clkdm_deny_idle_nolock(clkdm); |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
} |
|
|
|
/** |
|
* clkdm_in_hwsup - is clockdomain @clkdm have hardware-supervised idle enabled? |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Returns true if clockdomain @clkdm currently has |
|
* hardware-supervised idle enabled, or false if it does not or if |
|
* @clkdm is NULL. It is only valid to call this function after |
|
* clkdm_init() has been called. This function does not actually read |
|
* bits from the hardware; it instead tests an in-memory flag that is |
|
* changed whenever the clockdomain code changes the auto-idle mode. |
|
*/ |
|
bool clkdm_in_hwsup(struct clockdomain *clkdm) |
|
{ |
|
bool ret; |
|
|
|
if (!clkdm) |
|
return false; |
|
|
|
ret = (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false; |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* clkdm_missing_idle_reporting - can @clkdm enter autoidle even if in use? |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Returns true if clockdomain @clkdm has the |
|
* CLKDM_MISSING_IDLE_REPORTING flag set, or false if not or @clkdm is |
|
* null. More information is available in the documentation for the |
|
* CLKDM_MISSING_IDLE_REPORTING macro. |
|
*/ |
|
bool clkdm_missing_idle_reporting(struct clockdomain *clkdm) |
|
{ |
|
if (!clkdm) |
|
return false; |
|
|
|
return (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) ? true : false; |
|
} |
|
|
|
/* Public autodep handling functions (deprecated) */ |
|
|
|
/** |
|
* clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm' |
|
* in hardware-supervised mode. Meant to be called from clock framework |
|
* when a clock inside clockdomain 'clkdm' is enabled. No return value. |
|
* |
|
* XXX autodeps are deprecated and should be removed at the earliest |
|
* opportunity |
|
*/ |
|
void clkdm_add_autodeps(struct clockdomain *clkdm) |
|
{ |
|
struct clkdm_autodep *autodep; |
|
|
|
if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) |
|
return; |
|
|
|
for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { |
|
if (IS_ERR(autodep->clkdm.ptr)) |
|
continue; |
|
|
|
pr_debug("clockdomain: %s: adding %s sleepdep/wkdep\n", |
|
clkdm->name, autodep->clkdm.ptr->name); |
|
|
|
_clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr); |
|
_clkdm_add_wkdep(clkdm, autodep->clkdm.ptr); |
|
} |
|
} |
|
|
|
/** |
|
* clkdm_del_autodeps - remove auto sleepdeps/wkdeps from clkdm |
|
* @clkdm: struct clockdomain * |
|
* |
|
* Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm' |
|
* in hardware-supervised mode. Meant to be called from clock framework |
|
* when a clock inside clockdomain 'clkdm' is disabled. No return value. |
|
* |
|
* XXX autodeps are deprecated and should be removed at the earliest |
|
* opportunity |
|
*/ |
|
void clkdm_del_autodeps(struct clockdomain *clkdm) |
|
{ |
|
struct clkdm_autodep *autodep; |
|
|
|
if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) |
|
return; |
|
|
|
for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { |
|
if (IS_ERR(autodep->clkdm.ptr)) |
|
continue; |
|
|
|
pr_debug("clockdomain: %s: removing %s sleepdep/wkdep\n", |
|
clkdm->name, autodep->clkdm.ptr->name); |
|
|
|
_clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr); |
|
_clkdm_del_wkdep(clkdm, autodep->clkdm.ptr); |
|
} |
|
} |
|
|
|
/* Clockdomain-to-clock/hwmod framework interface code */ |
|
|
|
/** |
|
* clkdm_clk_enable - add an enabled downstream clock to this clkdm |
|
* @clkdm: struct clockdomain * |
|
* @clk: struct clk * of the enabled downstream clock |
|
* |
|
* Increment the usecount of the clockdomain @clkdm and ensure that it |
|
* is awake before @clk is enabled. Intended to be called by |
|
* clk_enable() code. If the clockdomain is in software-supervised |
|
* idle mode, force the clockdomain to wake. If the clockdomain is in |
|
* hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to |
|
* ensure that devices in the clockdomain can be read from/written to |
|
* by on-chip processors. Returns -EINVAL if passed null pointers; |
|
* returns 0 upon success or if the clockdomain is in hwsup idle mode. |
|
*/ |
|
int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *unused) |
|
{ |
|
if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable) |
|
return -EINVAL; |
|
|
|
pwrdm_lock(clkdm->pwrdm.ptr); |
|
|
|
/* |
|
* For arch's with no autodeps, clkcm_clk_enable |
|
* should be called for every clock instance or hwmod that is |
|
* enabled, so the clkdm can be force woken up. |
|
*/ |
|
clkdm->usecount++; |
|
if (clkdm->usecount > 1 && autodeps) { |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
return 0; |
|
} |
|
|
|
arch_clkdm->clkdm_clk_enable(clkdm); |
|
pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
|
|
pr_debug("clockdomain: %s: enabled\n", clkdm->name); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* clkdm_clk_disable - remove an enabled downstream clock from this clkdm |
|
* @clkdm: struct clockdomain * |
|
* @clk: struct clk * of the disabled downstream clock |
|
* |
|
* Decrement the usecount of this clockdomain @clkdm when @clk is |
|
* disabled. Intended to be called by clk_disable() code. If the |
|
* clockdomain usecount goes to 0, put the clockdomain to sleep |
|
* (software-supervised mode) or remove the clkdm autodependencies |
|
* (hardware-supervised mode). Returns -EINVAL if passed null |
|
* pointers; -ERANGE if the @clkdm usecount underflows; or returns 0 |
|
* upon success or if the clockdomain is in hwsup idle mode. |
|
*/ |
|
int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) |
|
{ |
|
if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_disable) |
|
return -EINVAL; |
|
|
|
pwrdm_lock(clkdm->pwrdm.ptr); |
|
|
|
/* corner case: disabling unused clocks */ |
|
if (clk && (__clk_get_enable_count(clk) == 0) && clkdm->usecount == 0) |
|
goto ccd_exit; |
|
|
|
if (clkdm->usecount == 0) { |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
WARN_ON(1); /* underflow */ |
|
return -ERANGE; |
|
} |
|
|
|
clkdm->usecount--; |
|
if (clkdm->usecount > 0) { |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
return 0; |
|
} |
|
|
|
arch_clkdm->clkdm_clk_disable(clkdm); |
|
pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
|
|
|
pr_debug("clockdomain: %s: disabled\n", clkdm->name); |
|
|
|
ccd_exit: |
|
pwrdm_unlock(clkdm->pwrdm.ptr); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* clkdm_hwmod_enable - add an enabled downstream hwmod to this clkdm |
|
* @clkdm: struct clockdomain * |
|
* @oh: struct omap_hwmod * of the enabled downstream hwmod |
|
* |
|
* Increment the usecount of the clockdomain @clkdm and ensure that it |
|
* is awake before @oh is enabled. Intended to be called by |
|
* module_enable() code. |
|
* If the clockdomain is in software-supervised idle mode, force the |
|
* clockdomain to wake. If the clockdomain is in hardware-supervised idle |
|
* mode, add clkdm-pwrdm autodependencies, to ensure that devices in the |
|
* clockdomain can be read from/written to by on-chip processors. |
|
* Returns -EINVAL if passed null pointers; |
|
* returns 0 upon success or if the clockdomain is in hwsup idle mode. |
|
*/ |
|
int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh) |
|
{ |
|
/* The clkdm attribute does not exist yet prior OMAP4 */ |
|
if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
|
return 0; |
|
|
|
/* |
|
* XXX Rewrite this code to maintain a list of enabled |
|
* downstream hwmods for debugging purposes? |
|
*/ |
|
|
|
if (!oh) |
|
return -EINVAL; |
|
|
|
return clkdm_clk_enable(clkdm, NULL); |
|
} |
|
|
|
/** |
|
* clkdm_hwmod_disable - remove an enabled downstream hwmod from this clkdm |
|
* @clkdm: struct clockdomain * |
|
* @oh: struct omap_hwmod * of the disabled downstream hwmod |
|
* |
|
* Decrement the usecount of this clockdomain @clkdm when @oh is |
|
* disabled. Intended to be called by module_disable() code. |
|
* If the clockdomain usecount goes to 0, put the clockdomain to sleep |
|
* (software-supervised mode) or remove the clkdm autodependencies |
|
* (hardware-supervised mode). |
|
* Returns -EINVAL if passed null pointers; -ERANGE if the @clkdm usecount |
|
* underflows; or returns 0 upon success or if the clockdomain is in hwsup |
|
* idle mode. |
|
*/ |
|
int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh) |
|
{ |
|
/* The clkdm attribute does not exist yet prior OMAP4 */ |
|
if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
|
return 0; |
|
|
|
if (!oh) |
|
return -EINVAL; |
|
|
|
return clkdm_clk_disable(clkdm, NULL); |
|
} |
|
|
|
/** |
|
* _clkdm_save_context - save the context for the control of this clkdm |
|
* |
|
* Due to a suspend or hibernation operation, the state of the registers |
|
* controlling this clkdm will be lost, save their context. |
|
*/ |
|
static int _clkdm_save_context(struct clockdomain *clkdm, void *unused) |
|
{ |
|
if (!arch_clkdm || !arch_clkdm->clkdm_save_context) |
|
return -EINVAL; |
|
|
|
return arch_clkdm->clkdm_save_context(clkdm); |
|
} |
|
|
|
/** |
|
* _clkdm_restore_context - restore context for control of this clkdm |
|
* |
|
* Restore the register values for this clockdomain. |
|
*/ |
|
static int _clkdm_restore_context(struct clockdomain *clkdm, void *unused) |
|
{ |
|
if (!arch_clkdm || !arch_clkdm->clkdm_restore_context) |
|
return -EINVAL; |
|
|
|
return arch_clkdm->clkdm_restore_context(clkdm); |
|
} |
|
|
|
/** |
|
* clkdm_save_context - Saves the context for each registered clkdm |
|
* |
|
* Save the context for each registered clockdomain. |
|
*/ |
|
void clkdm_save_context(void) |
|
{ |
|
clkdm_for_each(_clkdm_save_context, NULL); |
|
} |
|
|
|
/** |
|
* clkdm_restore_context - Restores the context for each registered clkdm |
|
* |
|
* Restore the context for each registered clockdomain. |
|
*/ |
|
void clkdm_restore_context(void) |
|
{ |
|
clkdm_for_each(_clkdm_restore_context, NULL); |
|
}
|
|
|